<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>背景平铺效果</title>
    <style>
        div {
            width: 400px;
            height: 400px;
            background-image: url(./images/1.png);
            /* 不平铺 盒子的左上角显示一张背景图 */
            /* background-repeat: no-repeat; */
            /* background-repeat: repeat; */
            /* background-repeat: repeat-x; */
            background-repeat: repeat-y;
        }
    </style>
</head>
<body>
    <div> 标签</div>
</body>
</html>